package cn.scw.common.utils.file;

import cn.scw.common.constant.Constants;
import cn.scw.common.exception.file.FileNameLengthLimitExceededException;
import cn.scw.common.exception.file.FileSizeLimitExceededException;
import cn.scw.common.exception.file.InvalidExtensionException;
import cn.scw.common.utils.BaiduImgUtils;
import cn.scw.common.utils.DateUtils;
import cn.scw.common.utils.StringUtils;
import cn.scw.common.utils.security.Md5Utils;
import cn.scw.framework.config.ApiConfig;
import net.coobird.thumbnailator.Thumbnails;
import org.apache.commons.io.FilenameUtils;
import org.springframework.web.multipart.MultipartFile;

import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;

/**
 * 文件上传工具类
 *
 * @author api
 */
public class FileUploadUtils {
    /**
     * 默认大小 50M
     */
    public static final long DEFAULT_MAX_SIZE = 50 * 1024 * 1024;

    public static final long DEFAULT_WAR_SIZE = 10 * 1024 * 1024;

    /**
     * 默认的文件名最大长度 100
     */
    public static final int DEFAULT_FILE_NAME_LENGTH = 100;

    /**
     * 默认上传的地址
     */
    private static String defaultBaseDir = ApiConfig.getProfile();

    private static int counter = 0;

    public static void setDefaultBaseDir(String defaultBaseDir) {
        FileUploadUtils.defaultBaseDir = defaultBaseDir;
    }

    public static String getDefaultBaseDir() {
        return defaultBaseDir;
    }

    /**
     * 以默认配置进行文件上传
     *
     * @param file 上传的文件
     * @return 文件名称
     * @throws Exception
     */
    public static final String upload(MultipartFile file) throws IOException {
        try {
            return upload(getDefaultBaseDir(), file, MimeTypeUtils.DEFAULT_ALLOWED_EXTENSION);
        } catch (Exception e) {
            throw new IOException(e.getMessage(), e);
        }
    }

    /**
     * 根据文件路径上传
     *
     * @param baseDir 相对应用的基目录
     * @param file    上传的文件
     * @return 文件名称
     * @throws IOException
     */
    public static final String upload(String baseDir, MultipartFile file) throws IOException {
        try {
            return upload(baseDir, file, MimeTypeUtils.DEFAULT_ALLOWED_EXTENSION);
        } catch (Exception e) {
            throw new IOException(e.getMessage(), e);
        }
    }

    /**
     * 上传文件
     *
     * @param file
     * @param baseDir
     * @return
     * @throws IOException
     */
    public final static void uploadStore(MultipartFile file, String baseDir) throws IOException {
        try {
            assertAllowed(file, MimeTypeUtils.DEFAULT_ALLOWED_EXTENSION);
//            InputStream inputStream = new ByteArrayInputStream(file.getBytes());
            File desc = new File(baseDir);
//            FileUtils.copyToFile(inputStream, desc);
            file.transferTo(desc);
        } catch (Exception e) {
            throw new IOException(e.getMessage(), e);
        }
    }

    /**
     * 上传文件
     *
     * @param file
     * @param baseDir
     * @return
     * @throws IOException
     */
    public final static String upload(MultipartFile file, String baseDir) throws IOException {
        try {
            int fileNamelength = file.getOriginalFilename().length();
            if (fileNamelength > FileUploadUtils.DEFAULT_FILE_NAME_LENGTH) {
                throw new FileNameLengthLimitExceededException(FileUploadUtils.DEFAULT_FILE_NAME_LENGTH);
            }

            assertAllowed(file, MimeTypeUtils.DEFAULT_ALLOWED_EXTENSION);
            String fileName = extractFilename(file);
//            InputStream inputStream = new ByteArrayInputStream(file.getBytes());
            File desc = getAbsoluteFile(baseDir, fileName);
//            FileUtils.copyToFile(inputStream, desc);
            compressionAllowed(file, desc,MimeTypeUtils.IMAGE_EXTENSION);//判断图片大小是否大于10M  如果大于压缩为20% 小于10M不压缩
//            file.transferTo(desc);
            return getPathFileName(baseDir, fileName);
        } catch (Exception e) {
            throw new IOException(e.getMessage(), e);
        }
    }

    /**
     * 文件上传
     *
     * @param baseDir 相对应用的基目录
     * @param file    上传的文件
     * @return 返回上传成功的文件名
     * @throws FileSizeLimitExceededException       如果超出最大大小
     * @throws FileNameLengthLimitExceededException 文件名太长
     * @throws IOException                          比如读写文件出错时
     * @throws InvalidExtensionException            文件校验异常
     */
    public static final String upload(String baseDir, MultipartFile file, String[] allowedExtension)
            throws FileSizeLimitExceededException, IOException, FileNameLengthLimitExceededException,
            InvalidExtensionException {
        int fileNamelength = file.getOriginalFilename().length();
        if (fileNamelength > FileUploadUtils.DEFAULT_FILE_NAME_LENGTH) {
            throw new FileNameLengthLimitExceededException(FileUploadUtils.DEFAULT_FILE_NAME_LENGTH);
        }

        assertAllowed(file, allowedExtension);

        String fileName = extractFilename(file);

        File desc = getAbsoluteFile(baseDir, fileName);
        file.transferTo(desc);
        String pathFileName = getPathFileName(baseDir, fileName);

        return pathFileName;
    }

    /**
     * 编码文件名
     */
    public static final String extractFilename(MultipartFile file) {
        String fileName = file.getOriginalFilename();
        String extension = getExtension(file);
        fileName = DateUtils.datePath() + "/" + encodingFilename(fileName) + "." + extension;
        return fileName;
    }

    private static final File getAbsoluteFile(String uploadDir, String fileName) throws IOException {
        File desc = new File(uploadDir + File.separator + fileName);

        if (!desc.getParentFile().exists()) {
            desc.getParentFile().mkdirs();
        }
        if (!desc.exists()) {
            desc.createNewFile();
        }
        return desc;
    }

    public static final String getPathFileName(String uploadDir, String fileName) throws IOException {
        int dirLastIndex = ApiConfig.getProfile().length() + 1;
        String currentDir = StringUtils.substring(uploadDir, dirLastIndex);
        String pathFileName = Constants.RESOURCE_PREFIX + "/" + currentDir + "/" + fileName;
        return pathFileName;
    }

    /**
     * 编码文件名
     */
    public static final String encodingFilename(String fileName) {
        fileName = fileName.replace("_", " ");
        fileName = Md5Utils.hash(fileName + System.nanoTime() + counter++);
        return fileName;
    }

    /**
     * 文件大小校验
     *
     * @param file 上传的文件
     * @return
     * @throws FileSizeLimitExceededException 如果超出最大大小
     * @throws InvalidExtensionException
     */
    public static final void assertAllowed(MultipartFile file, String[] allowedExtension)
            throws FileSizeLimitExceededException, InvalidExtensionException {
        long size = file.getSize();
        if (DEFAULT_MAX_SIZE != -1 && size > DEFAULT_MAX_SIZE) {
            throw new FileSizeLimitExceededException(DEFAULT_MAX_SIZE / 1024 / 1024);
        }

        String fileName = file.getOriginalFilename();
        String extension = getExtension(file);
        if (allowedExtension != null && !isAllowedExtension(extension, allowedExtension)) {
            if (allowedExtension == MimeTypeUtils.IMAGE_EXTENSION) {
                throw new InvalidExtensionException.InvalidImageExtensionException(allowedExtension, extension,
                        fileName);
            } else if (allowedExtension == MimeTypeUtils.FLASH_EXTENSION) {
                throw new InvalidExtensionException.InvalidFlashExtensionException(allowedExtension, extension,
                        fileName);
            } else if (allowedExtension == MimeTypeUtils.MEDIA_EXTENSION) {
                throw new InvalidExtensionException.InvalidMediaExtensionException(allowedExtension, extension,
                        fileName);
            } else {
                throw new InvalidExtensionException(allowedExtension, extension, fileName);
            }
        }

    }

    /**
     * 判断MIME类型是否是允许的MIME类型
     *
     * @param extension
     * @param allowedExtension
     * @return
     */
    public static final boolean isAllowedExtension(String extension, String[] allowedExtension) {
        for (String str : allowedExtension) {
            if (str.equalsIgnoreCase(extension)) {
                return true;
            }
        }
        return false;
    }

    /**
     * 获取文件名的后缀
     *
     * @param file 表单文件
     * @return 后缀名
     */
    public static final String getExtension(MultipartFile file) {
        String extension = FilenameUtils.getExtension(file.getOriginalFilename());
        if (StringUtils.isEmpty(extension)) {
            extension = MimeTypeUtils.getExtension(file.getContentType());
        }
        return extension;
    }

    /**
     * 图片压缩
     *
     * @param file 上传的文件
     * @return
     * @throws FileSizeLimitExceededException 如果超出最大大小
     * @throws InvalidExtensionException
     */
    public static final void compressionAllowed(MultipartFile file,File srFile,String[] allowedExtension)
            throws FileSizeLimitExceededException, InvalidExtensionException, IOException {
        long size = file.getSize();
        String extension = getExtension(file);
        if (DEFAULT_WAR_SIZE != -1 && size > DEFAULT_WAR_SIZE&&isAllowedExtension(extension, allowedExtension)) {
                Thumbnails.of(file.getInputStream())
                        .scale(1f)
                        .outputQuality(0.59f)
                        .toFile(srFile);

              /*  // 处理图片后返回物理路径
                String imgPath = BaiduImgUtils.imgSet(newPath, r, g, b);
                // 截取实际物理路径后边文件路径，不要前边映射的实际路径
                String suffix = imgPath.substring(imgPath.indexOf("upload/"));
                // 删除处理前图片
                FileUtils.deleteFile(newPath);*/


        }else{
            file.transferTo(srFile);
        }

    }
}
